Method and device for enabling multi-carriers aggregation transmission

• US 9,137,003 B2
• Filed: 11/04/2009
• Issued: 09/15/2015
• Est. Priority Date: 11/04/2008
• Status: Active Grant

• Current Assignee: Datang Mobile Communications Equipment Company Limited (China Information Communication Technology Group Co. Ltd.)
• Original Assignee: China Academy of Telecom Technology (China Information Communication Technology Group Co. Ltd.)
• Inventors: Pan, Xueming, Xiao, Guojun, Ding, Yu, Suo, Shiqiang, Sun, Shaohui
• Primary Examiner(s): Vu, Huy D
• Assistant Examiner(s): HALL, TEISHA DANEA
• Application Number:
  US13/127,539
• Publication Number:
  US 20110261714A1
• Time in Patent Office: 2,141 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority
• CPC Class Codes: H04L 5/0069 Allocation based on distance or geographical location allocation based on terminal or device properties in general, H04W72/51
• CPC Class Codes: H04L 5/0092 Indication of how the channel is divided
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04L 5/1469 using time-sharing

Abstract

The present invention discloses a transmission method with multi-carrier aggregation, which includes: performing uplink and downlink configurations for each of the component carriers aggregated in a cell and ensuring coexistence of at least one identical uplink sub-frame and at least one identical downlink sub-frame between at least two of the component carriers and compliance of the configuration of at least one of the component carriers with an uplink and downlink configuration of R8; and transmitting the uplink and downlink configuration of any one of the component carriers and those of the other component carriers aggregated with the any one component carrier to an LTE-A UE accessing the corresponding component carrier. The invention further provides a transmission device with multi-carrier aggregation. With the invention, uplink and downlink configurations in an LTE-A system can be performed to accommodate a demand of a TDD system.

Claims

1. A transmission method with Time Division Duplex (TDD) multi-carrier aggregation, comprising:

performing uplink and downlink configurations for each of a plurality of component carriers aggregated in a cell while ensuring coexistence of at least one identical uplink sub-frame and at least one identical downlink sub-frame between at least two of the component carriers and compliance of the configuration of at least one of the component carriers with an uplink and downlink configuration of R8; and

transmitting the uplink and downlink configuration of any one of the component carriers and those of other component carriers aggregated with the any one of the component carriers to an LTE-A UE accessing a corresponding component carrier, wherein the LTE-A UE is scheduled over sub-frames that are all in the uplink or downlink in a plurality of aggregated component carriers when the LTE-A UE is to receive or transmit data simultaneously over a plurality of carriers.

2. The method according to claim 1, wherein, the step of performing uplink and downlink configurations for each of the component carriers aggregated in a cell comprises:

performing the same uplink and downlink configuration for each of the component carriers aggregated together;

or

performing different uplink and downlink configurations for each of the component carriers aggregated together.

3. The method according to claim 1, wherein, the step of performing uplink and downlink configurations for each of the component carriers aggregated in a cell comprises:

determining whether contiguous or non-contiguous carrier aggregation applies in the cell, and if contiguous carrier aggregation applies, then performing the same uplink and downlink configuration for all of the component carriers, or if non-contiguous carrier aggregation applies, then performing uplink and downlink configuration separately for each of the component carriers.

4. The method according to claim 1, wherein, the step of transmitting the uplink and downlink configuration of any one of the component carriers and those of the other component carriers aggregated with the any one of the component carrier to an LTE-A UE accessing the corresponding component carrier comprises:

transmitting the uplink and downlink configuration of the any one of the component carriers and those of the other component carriers aggregated with the any one of the component carrier in a broadcast message;

or

transmitting the uplink and downlink configuration of the any one of the component carrier and those of the other component carriers aggregated with the any one of the component carriers in upper layer signaling over the any one of the component carriers.

5. The method according to claim 4, wherein, the step of transmitting the uplink and downlink configurations of the other component carriers aggregated with the any one of the component carrier comprises:

transmitting the uplink and downlink configurations of the other component carriers aggregated with the any one of the component carriers sequentially;

or

transmitting information on whether the uplink and downlink configurations of the other component carriers are the same as that of the any one of the component carriers and the uplink and downlink configurations of the other component carriers different from that of the any one of the component carriers;

or

transmitting the uplink and downlink configurations of the other component carriers different from that of the any one of the component carrier.

6. The method according to claim 1, further comprising:

after performing the uplink and downlink configurations for each of the component carriers, transmitting the uplink and downlink configuration of any one of the component carriers to an LTE R8 UE accessing the corresponding component carrier.

7. The method according to claim 1, wherein, a correspondence relationship table between each component carrier subject to the multi-carrier aggregation and lengths of cyclic prefixes configured for the component carrier is preconfigured at the LTE-A UE, and the step of scheduling the LTE-A UE over sub-frames, all of which are in the uplink or downlink, over a plurality of aggregated component carriers comprises:

performing, by the LTE-A UE, Inverse Discrete Fourier Transform on data over each component carrier to acquire Orthogonal Frequency Division Multiplexing symbols over the respective component carriers; and

inserting, by the LTE-A UE, a cyclic prefix in the time domain of each of the component carriers according to the preconfigured correspondence relationship table so that the cyclic prefix and a predetermined number of OFDM symbols over the component carrier constitute a sub-frame.

8. The method according to claim 7, wherein, the step of performing Inverse Discrete Fourier Transform on data over each component carrier comprises performing Inverse Discrete Fourier Transform respectively on the data over each component carrier or performing Inverse Discrete Fourier Transform uniformly on the data over each component carrier.

9. The method according to claim 7, wherein, the LTE-A UE configures the correspondence relationship table by:

searching for the cell to detect the type of a downlink cyclic prefix for a first component carrier subject to multi-carrier aggregation;

receiving a message over the first component carrier according to the type of the downlink cyclic prefix and acquiring, from the message, information on a configured uplink cyclic prefix for the first component carrier as well as information on configured uplink cyclic prefixes and information on configured downlink cyclic prefixes for the other component carriers subject to multi-carrier aggregation; and

configuring the correspondence relationship table between the component carriers and information on configured cyclic prefixes according to the acquired information on the configured uplink cyclic prefixes and information on the configured downlink cyclic prefixes for each of the component carriers.

10. The method according to claim 9, further comprising:

after the step of acquiring by the LTE-A UE, from the message, information on a configured uplink cyclic prefix for the first component carrier as well as information on configured uplink cyclic prefixes and information on configured downlink cyclic prefixes for the other component carriers subject to multi-carrier aggregation,

scheduling, by a base station, the LTE-A UE over the corresponding component carrier in a scheduling policy according to a service to be preformed for the UE.

11. The method according to claim 10, wherein, scheduling, by the base station, the LTE-A UE over the corresponding component carrier in a scheduling policy comprises:

determining, by the base station, whether a transmission quality required for the service is above a predetermined transmission quality threshold or a required coverage range is above a predetermined coverage range threshold or a required transmission efficiency is below a predetermined transmission efficiency threshold, and if so, then scheduling the LTE-A RE over a component carrier configured with an extended cyclic prefix;

or otherwise, scheduling the LTE-A RE over a component carrier configured with a normal cyclic prefix.

12. The method according to claim 11, wherein, scheduling, by the base station, the LTE-A UE over the corresponding component carrier in a scheduling policy comprises:

determining, by the base station, whether the amount of data required for the service is above a predetermined amount-of-data threshold, and if so, then scheduling the LTE-A RE to operate over more than one component carriers.

13. A transmission method with Time Division Duplex (TDD) multi-carrier aggregation, comprising:

receiving, by an LTE-A UE, over an access carrier thereof, an uplink and downlink configuration of the access carrier and those of other component carriers aggregated with the access carrier transmitted from a base station; and

receiving, by an LTE UE, over the access carrier thereof by the LTE UE, an uplink and downlink configuration of the access carrier transmitted from the base station, wherein physical or logic resources are preset over each component carrier to carry information on the uplink and downlink configuration of a current carrier and those of other carriers aggregated with the current carrier;

extracting, by the LTE-A UE, the uplink and downlink configuration of the access carrier over the physical or logic resource preset over the access carrier to carry the information on the uplink and downlink configuration of the access carrier and extracting the uplink and downlink configurations of the other carriers aggregated with the access carrier over the physical or logic resource preset over the access carrier to carry the information on the uplink and downlink configuration of the other carriers aggregated with the access carrier, wherein the LTE-A UE is scheduled over sub-frames that are all in the uplink or downlink in a plurality of aggregated carriers when the LTE-A UE is to receive or transmit data simultaneously over a plurality of carriers; and

extracting, by the LTE UE, the uplink and downlink configuration of the access carrier over the physical or logic resource preset over the access carrier to carry the information on the uplink and downlink configuration of the access carrier.

14. A transmission device with Time Division Duplex (TDD) multi-carrier aggregation, comprising:

a configuration module configured to perform uplink and downlink configurations for each of a plurality of component carriers aggregated in a cell while ensuring coexistence of at least one identical uplink sub-frame and at least one identical downlink sub-frame between at least two of the component carriers and compliance of the configuration of at least one of the component carriers with an uplink and downlink configuration of R8; and

a transmission module configured to transmit the uplink and downlink configuration of any one of the component carriers and those of other component carriers aggregated with the any one of the component carriers to an LTE-A UE accessing a corresponding component carrier wherein the LTE-A UE is scheduled over sub-frames that are all in the uplink or downlink in a plurality of aggregated component carriers when the LTE-A UE is to receive or transmit data simultaneously over a plurality of carriers.

15. The device according to claim 14, wherein, the transmission module is configured to transmit the uplink and downlink configuration of the any one of the component carriers and those of the other component carriers aggregated with the any one of the component carriers in a broadcast message;

or

the transmission module is configured to transmit the uplink and downlink configuration of the any one of the component carriers and those of the other component carriers aggregated with the any one of the component carriers in upper layer signaling of the any one of the component carrier.

16. The device according to claim 15, wherein, the transmission module transmits the uplink and downlink configurations of the other component carriers aggregated with the any one of the component carriers by:

transmitting the uplink and downlink configurations of the other component carriers aggregated with the any one of the component carriers sequentially;

or

transmitting information on whether the uplink and downlink configurations of the other component carriers are the same as that of the any one of the component carriers and the uplink and downlink configurations of the other component carriers different from that of the any one of the component carriers;

or

transmitting the uplink and downlink configurations of the other component carriers different from that of the any one of the component carriers.

17. The device according to claim 14, further comprising:

a removal unit configured to perform an operation of removing the cyclic prefix from the sub-frame received over each of the component carriers according to the correspondence relationship table preconfigured by the correspondence relationship unit to acquire the OFDM symbols over each component carrier; and

a transform unit configured to perform Discrete Fourier Transform on the OFDM symbols over each of the component carriers acquired by the removal unit.

18. The device according to claim 14, wherein, the inverse transform unit comprises a plurality of inverse transform sub-units, each of which corresponds to one of the component carriers and is configured to perform Inverse Discrete Fourier Transform on the data over the corresponding component carrier.

19. The device according to claim 17, wherein, the transform unit comprises a plurality of transform sub-units, each of which corresponds to one of the component carriers and is configured to perform Discrete Fourier Transform on the OFDM symbols over the corresponding component carrier.